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Update example to use expression parsing

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This commit is contained in:
Tim Schaub
2013-06-26 17:51:02 -06:00
parent b7412552a5
commit aab5c8472c
2 changed files with 13 additions and 6 deletions
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17
examples/kml-timezones.js
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@@ -1,7 +1,7 @@
goog.require('ol.Expression');
goog.require('ol.Map');
goog.require('ol.RendererHint');
goog.require('ol.View2D');
goog.require('ol.expr');
goog.require('ol.layer.TileLayer');
goog.require('ol.layer.Vector');
goog.require('ol.parser.KML');
@@ -12,8 +12,15 @@ goog.require('ol.style.Polygon');
goog.require('ol.style.Rule');
goog.require('ol.style.Style');
// calculate opacity based on difference from local noon
function getOpacity(feature) {
/**
* Register a function to be used in a symbolizer. Here we want the opacity
* of polygons to be based on the offset from local noon. For example, a
* timezone where it is currently noon would have an opacity of 1. And a
* timezone where it is currently 6:00am would have an opacity of 0.5.
*/
ol.expr.register('getOpacity', function() {
var feature = this;
var opacity = 0;
var name = feature.get('name'); // e.g. GMT -08:30
var match = name.match(/([-+]\d{2}):(\d{2})$/);
@@ -31,7 +38,7 @@ function getOpacity(feature) {
opacity = 1 - offset / 12;
}
return opacity;
}
});
var style = new ol.style.Style({rules: [
new ol.style.Rule({
@@ -39,7 +46,7 @@ var style = new ol.style.Style({rules: [
new ol.style.Polygon({
fillColor: '#ffff33',
strokeColor: '#ffffff',
opacity: new ol.Expression('getOpacity(this)')
opacity: ol.expr.parse('getOpacity()')
})
]
})